She's amazing in any of the 99 of any landfall deck as well as the leader too, since most landfall stuff is Mono-Green
Although on its own the Remand does not solve any real problems it does provide both time and information which if put to good use can enable you to negate the card in question through play rather than needing a specific answer
Emrakul, the Aeons Torn is the obvious answer, but you can probably look at Sundering Titan, Progenitus, or a host of other finishers depending on the matchup
You can buy time until you're ready to go off with cards like High Tide and Frantic Search to copy these spells and amass significant quantities of mana to finish things off with the likes of Brain Freeze or even Empty the Warrens + First Day of Class
These boxes fit a double-sleeved deck just a little tight, which is probably their worst trait
Actions can do virtually everything